<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/vue.js"></script>
</head>
<body>
    <div id="app">
        <div>
            {{ num }}
        </div>
        <div>
            <button v-on:click = "add()">+1</button>
            <button @click = "add()">简写+1</button>
            <button v-on:click = "num--">-1</button>
        </div>
    </div>
</body>
<script>
        var app = new Vue({
            el:"#app",
            data:{
                num:10
            },
            methods:{
                add(){
                    this.num++
                }
            }
        })
</script>
</html>